The given options show the bacterial count, oxygen level and the number of green plants and animals in the river near each of four towns A, B, C and D. Which town is situated near an unpolluted river?
| Bacterial count |
Oxygen level |
Number of green plants |
Number of animals |
|
|---|---|---|---|---|
| A | Low | High | Few | Few |
| B | High | Low | Few | Many |
| C | High | Low | Few | Few |
| D | Low | High | Many | Many |